Fast you read you can’t finish the book in two days.A. soB. ifC. asD. although

问题补充：

Fast you read, you can’t finish the book in two days.

A. so

B. if

C. as

D. although

答案：

A. so

B. if

(答案→)C. as

D. although

解析：考查倒装。在四个选项中，只有as引导让步状从时，才把状语提到句首，所以选C。